To be honest, I haven't played a huge amount of http://rover.ebay.com/rover/1/711-53200-19255-0/1?toolid=10029&campid=CAMPAIGNID&customid=CUSTOMID&catId=267&type=2&ext=181069445990&item=181069445990 yet, and the character I was using was around 27-28 I guess when this first started happening. He's now 31, and its just ridiculous, it's literally not safe to walk around for too long without toggling god mode. Swarms of wild animals and monster willl gang up and attack any npc's they can find. Is this supposed to be happening?
I only had 2 mods that affected creatures (although both had been on from lvl 1, and this only started around 27), Skyrim Monster Mod and Bellyache's Animal and Creature Pack. I removed SMM, but even after that it just put in vanilla creatures (the amount of them was still the same). The creature pack only adds textures, so it should be affecting anything.